Silent door stop



Feb 6, 1940- J. A. UNDERHILL 2,189,048

T R TOP Filed Dec. 17, 1938 )lilla umm /NVENoR By J.A UNDERH/LL @tz-ddd ATTORNEY Patented Feb.

" [STATES SILENT Doon s'roP Joseph VA.. Underhill; .New YorkY. v, l H Application December 17, '1938, Serial No. 246,271

2 claims. (ci. 1e-Ese) Y This invention relates to a silent doorstop and,

.- more particularly, to a silent door stop provided the hard wooden tip with some degree Iof force,

the'attendant bang produced an objectionfably loud noise and also caused a scar on thedoor.

To .mitigate these deleterious effects in some` measure, subsequent door stops were made with f a'solid'rubber tip Which-was sometimes mounted I against ythe tip.

upon a studprol'ecting from the body of the Vdoor stop.'` This was somey improvement but 'was not entirely satisfactory as there was only a small amount of rubber protruding between the end of the stud and the point where a door would strike it.

Accordingly, Iit is an object of this invention to provide a silent door stop of pleasing appear-y ance with shock-absorbing means for protecting walls and for obviating the noise and scars pro'- ducedby bangs. It is also an object of the invention to provide a silent door stop with a tip composed of resilient material having an air-chamber formed therein `for silently absorbing the shock, or force, produced by a door being bumped thereagainst.

These objects are attained by providing a body member of attractive material with a resilient tip composed preferably ofsoft rubber. Theresilient tip',` y'has an air-chamber formed therein Which extends considerably beyond the end of the body member and nearlyI to the external 'end of the tip.y This air-chamber acts as a cushion and serves to silently absorb the impact of a door Theseand other features ofthe invention will be 'more fully described in detail in connection with the following detailed description of .the

drawing inwhich:

1 is a view in perspective of the silent door stop;

Fig. 2 is a perspective view -of the resilient tip andthe air-chamber formed therein;

Fig. Sis a front sectional view of the silent door step secured to a wall and showing itat the moment ofthe impact of a door against the tip; and V i Fig. 4 is a side view of a modied form of the silent door stop designed to be secured I'to a 'floor insteadoftoawall. v,

The silent door stop is shown'to comprise ia body member I of any suitable attractive-ma.-

teriaL preferably a Well known kind of thermoplastic material, such as cellulose acetate, which will not tarnish, chip, or peal. l Thisjbody member I isv molded, orformed, intofanytplea'sing shape', such as that shown inv Fig. `1,lwhie`h includes, a base `2 the finsidefof `which -holdsbne squared portion 4 which is preferablyrstraightlknurledrfor assisting-in,screwing the doorL stop into some base ,5, such as :the baseboard. of `a wall. y

The other end. of thebody-,member ,I is enlarged to vform ,a :head Ihaving anorice kfor end of a .dowel screw13.; Abovefthe'base- 2 Visca snugly receiving one vlend ofa resilientcylindrical tip 'I composed of` any suitable material, such as soft rubber. The `outer end of tip 'I isrounded. Formed in the other end of the tipv 'I is a cylindrical air-chamber 8, as is shown in Fig. 2. To

v'insert the rubber tip 'I into the orice in the head 6 of body member I, the rubber cylinder 'I is pinched or squeezed together at its open end thereby compressing the air-chamber 8 and expelling a certain amount of air therefrom. Thev rubber cylinder 1 is then forced into the orice in the head 6 and allowed to'assume its normal shape but, in so doing, it creates a partial vacuum which, together with friction, retains the rubber cylinder 'I rmly and securely .within said orifice. It should be noted that, for increased flexibility, the greater part of this air-chamber 8 extends beyond the end of body member I, as is shown in Fig. 3, and that the air-cushion 8 also extends well into the external rounded end of tip 1 sothat there is only a relatively thin Wall of rubber between air-cushion 8 and the point where a door II strikes against tip ',I.

To economize on material, a cavity, or air-y chamber 9, is hollowed outA of body member I, as

of soft subber which is relatively thin at thepoint where the door vII strikes it and since the air-chamber 8 protrudes considerably beyond the `end of the body member I, the air-chamber 8 silently cushions, or absorbs the shock and thud,

or noise, of the door II banging against the tip 1 with the result that the impact of the door II againsttip 'I is silent.

A modification of the invention is shown in Fig. 4 which illustrates a silent door stop, embodying the principles of the invention, designed for being secured to a floor. This modified silent door stop comprises a base I2 and a squared portion llt. similar,..to.,ba se, 2 and. squared, portion 4.

Above .this :squaredjportion I 4 is an" lenlargement f forming a head I6 which is squared in shape for enabling the silent door stop to be secured to a floor by means ci' a wrench without marring the4 surface of the thermo-plastic material. 'I llse'head'V 6, head I6 is provided with an oriceior snugly,...

receiving one-end of a resilient cylindrical tip `I1 which is similar to tip'llandwhichhas van -g i air-chamber, similar to air-chamber 8,I protrudi When this' modied' -silentdoorstep issecurely positioned on a floor,

ing beyond the head I6.

it operates in thev same silentl manner as that .described forthe-silent door stop shown in Figs.

-.1-;and.3.V f. `..-;-,It is to bel understoodthat thevabove descrip? tion and;illustrations,,are forpthey purpose of describing. andy illustratingA the principles and '.features oioperation vof the invention and that the invention--i'snot to be' limited to the specific shapes ...or ldimensions'f; shown and. described.

"Various modi'cations. in the construction of .the

silent vdoor stop' mayl be made without depart- -ing from the spirit andz'scope :of the vinvention Whichl is yto be 'limited .only bythe claims pended hereto. d l

-. What is'claimed is: 1

1; A silent door y-stop forabsorbing the noise that wouldl otherwise be caused by the impact cylinder.

of a door thereagainsnsaid silent door ystopin- .f t cluding in combination a body member having a dowel screw embedded therein `for enabling .the door stop to be secured to a base, a smooth and flangeless hollow rubber cylinder open at one end, and a thin wall of rubber molded integrally with said hollowrubber cylinder at the f other end thereof for vforming an air-chamber therein, said body member lhaving an enlarged 1 head for, snugly engaging andsecurely retaining by ,friction the open end of said rubber cylinderv for forming an air-tight air-chamber extending);y

appreciably beyond the end of said body member` and having only said thin Wall of rubber at its outer end for increasing the ability of the air-l chamber to silently cushion ther impact of a door against the tip of the rubber cylinder.

2.' A silent door' stop for absorbing the noise:

that would otherwise be produced by the impact` of a door thereagainst, said silent door stopini cluding in combination a body. memberxhaving in the body memberand the chamberin the rubber cylinder lfor silently cushioning the -im, pact of a door against the end of said rubber cylinder, said air-tightair-chamber havingl a,

partial vacuum for securely retainingsaidrubber Y JOSEPH AUNDERH'ILLI 

